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I am carrying out some research, and I realised that my DV is going to be categorical. I originally planned on carrying out an ANCOVA; I have 1 IV with three levels, 1 DV and 4 covariates. After doing some revision, I realised that my DV will need to be categorial( yes, no)- but I am not sure what test to run- any ideas?

Catarina Gaglianone
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  • Welcome to Cross Validated! What would you do for a continuous dependent variable (DV)? – Dave Aug 17 '22 at 18:40
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    Is the dependent variable binary ? That is, it can only have one of two categories - Yes or No ? If so, you can use logistic regression. The model will have a form similar to ancova, but will be a generalized linear model rather than a general linear model. – Sal Mangiafico Aug 17 '22 at 18:41
  • yes, it is binary. How would a logistic regression work with the covariates? – Catarina Gaglianone Aug 17 '22 at 18:43
  • You just do the logistic regression with the covariates in the model. Do you know how to interpret ANCOVA (and ANOVA for that matter) as linear regression? – Dave Aug 17 '22 at 18:45
  • It has been a while since I worked with regression, let alone interpreting ANCOVA (and ANOVA for that matter) as linear regression. So I will have to revise that. Any suggestions on readings( articles, books etc...)? – Catarina Gaglianone Aug 17 '22 at 18:48
  • We must have a bunch of good stuff on here; I would welcome links from others. For a book, I learned this stuff from Agresti’s *Foundations of Linear and Generalized Linear Models”, though not once did my graduate classes mention ANCOVA. I only know about it because it saw it written on a board when I was on campus a few weeks after graduation, remembered having heard that term before I studied statistics in detail, looked up ANCOVA on Wikipedia, and realized it’s just a special case of linear regression. – Dave Aug 17 '22 at 18:50
  • It will be important for you to understand ANCOVA as a regression in order for any responses to your question to make sense, as the answer is basically just to stick a link function on the left side with your dependent variable. – Dave Aug 17 '22 at 18:52
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    You might also mention which software package you intend to use. This should be straightforward in any capable statistical analysis package. – Sal Mangiafico Aug 17 '22 at 19:49
  • See this page on this site, and its links, for how AN(C)OVA can be considered a form of linear regression, with categorical predictors for the ANOVA factors and continuous predictors for the covariates (C) to adjust for. Or use this site's search function to find many more, like this page and this page. – EdM Aug 17 '22 at 20:30
  • thank you, for your help – Catarina Gaglianone Aug 22 '22 at 16:11

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